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Marketable Securities and Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | $ 124,876,806 | $ 115,759,800
Liabilities, fair value | 360,795 | 1,167,614
Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 21,237,962 | 30,130,388
Liabilities, fair value |  | 0
Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 103,638,844 | 85,629,412
Liabilities, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Liabilities, fair value | 360,795 | 1,167,614
Money market funds |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 9,843,482 | 10,300,813
Money market funds | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 9,843,482 | 10,300,813
Money market funds | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Money market funds | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Mutual funds |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 68,565,889 | 60,589,746
Mutual funds | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Mutual funds | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 68,565,889 | 60,589,746
Mutual funds | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
US corporate debt securities |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 35,072,955 | 25,039,666
US corporate debt securities | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
US corporate debt securities | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 35,072,955 | 25,039,666
US corporate debt securities | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Investments in affiliated entities |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 11,394,480 | 19,829,575
Investments in affiliated entities | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 11,394,480 | 19,829,575
Investments in affiliated entities | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Investments in affiliated entities | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Common stock warrants |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Liabilities, fair value | 360,795 | 1,167,614
Common stock warrants | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Liabilities, fair value |  | 0
Common stock warrants | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Liabilities, fair value | 0 | 0
Common stock warrants | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Liabilities, fair value | $ 360,795 | $ 1,167,614

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